Calculate Tension in Rope: Principle of Moments Homework

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Homework Help Overview

The discussion revolves around calculating the tension in a rope using the principle of moments, specifically in the context of a beam under various forces. The original poster presents a scenario involving torque calculations and seeks clarification on a discrepancy between their result and a textbook answer.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • The original poster attempts to calculate the tension by equating the torque from the weights to the torque from the rope's tension. They express uncertainty regarding their arithmetic and the resulting tension value compared to the textbook answer.

Discussion Status

Participants are engaged in clarifying the arithmetic involved in the torque calculations. Some guidance is offered regarding checking calculations, and there is an acknowledgment of common mistakes in such problems. The discussion reflects a supportive atmosphere without reaching a consensus on the correct tension value.

Contextual Notes

The original poster references a specific textbook answer, indicating a potential discrepancy that is under examination. There is an implication of a diagram that is not visible in the thread, which may affect the understanding of the problem setup.

Marcus27
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Homework Statement


Calculate the tension in the rope, T, in the diagram below: http://imageshack.com/a/img905/2848/yMC01l.png

Homework Equations

The Attempt at a Solution


The 'beam' is a stable structure, thus the resultant forces be equal that are acting upon the beam. So,
I calculated the the Torque from the mass as being 150N * 0.6m + 100N * 0.3m = 110 Nm, setting this equal to the Torque generated by the 'force line' from the rope, T*1.2m = 110Nm, thus T rounded to the nearest Newton is = 92N. I Felt fairly confident with this until my textbook said the tension in the rope is = to 100N. Can anybody clear this up for me and explain where I went wrong, Thanks!.
 
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Marcus27 said:
150N * 0.6m + 100N * 0.3m = 110 Nm
Check your arithmetic, that's "the usual suspect."
 
Ah, thank you. I did not spot that mistake, sorry for wasting your time. Not a great first post on my part o:)
 
Do not let it ruin your day --- we've all been there.
 

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